/* Support for opening stores named in URL syntax.

   Copyright (C) 2001,02 Free Software Foundation, Inc.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */

#include "store.h"
#include <string.h>
#include <stdlib.h>


/* Similar to store_typed_open, but NAME must be in URL format,
   i.e. a class name followed by a ':' and any type-specific name.
   Store classes opened this way must strip off the "class:" prefix.
   A leading ':' or no ':' at all is invalid syntax.  */

error_t
store_url_open (const char *name, int flags,
		const struct store_class *const *classes,
		struct store **store)
{
  if (name == 0 || name[0] == ':' || strchr (name, ':') == 0)
    return EINVAL;

  return store_typed_open (name, flags, classes, store);
}

error_t
store_url_decode (struct store_enc *enc,
		  const struct store_class *const *classes,
		  struct store **store)
{
  const struct store_class *cl;

  /* This is pretty bogus.  We use decode.c's code just to validate
     the generic format and extract the name from the data.  */
  struct store dummy, *dummyptr;
  error_t dummy_create (mach_port_t port, int flags, size_t block_size,
			const struct store_run *runs, size_t num_runs,
			struct store **store)
    {
      *store = &dummy;
      return 0;
    }
  struct store_enc dummy_enc = *enc;
  error_t err = store_std_leaf_decode (&dummy_enc, &dummy_create, &dummyptr);
  if (err)
    return err;

  /* Find the class matching this name.  */
  cl = store_find_class (dummy.name, strchr (dummy.name, ':'), classes);
# pragma weak store_module_find_class
  if (cl == 0 && store_module_find_class)
    err = store_module_find_class (dummy.name, strchr (dummy.name, ':'),
				   &cl);
  free (dummy.name);
  free (dummy.misc);

  if (cl == 0)
    return EINVAL;

  /* Now that we have the class, we just punt to its own decode hook.  */

  return (!cl->decode ? EOPNOTSUPP : (*cl->decode) (enc, classes, store));
}

/* This class is only trivially different from the "typed" class when used
   by name.  Its real purpose is to decode file_get_storage_info results
   that use the STORAGE_NETWORK type, for which the convention is that the
   name be in URL format (i.e. "type:something").  */

const struct store_class store_url_open_class =
{
  .id = STORAGE_NETWORK,
  .name = "url",
  .open = store_url_open,
  .decode = store_url_decode
};
STORE_STD_CLASS (url_open);
